Fluid power system and valve mechanism therefor

Claim 1

A CONTROL VALVE FOR USE IN A POWER SYSTEM FOR PROVIDING A REGENERATIVE CIRCUIT FOR AN ASSOCIATED FLUID POWERED, DOUBLE ACTING MOTOR UNIT COMPRISING, A VALVE BODY HAVING FIRST AND SECOND CHAMBERS THEREIN, A FIRST PASSAGEWAY COMMUNICATING SAID CHAMBERS WITH ONE ANOTHER, A FIRST VALVE MECHANISM DISPOSED IN SAID PASSAGEWAY AND EXTENDING INTO SAID FIRST AND SECOND CHAMBERS, SAID FIRST VALVE MECHANISM COMPRISING AN AXIALLY MOVABLE SLEEVELIKE MEMBER, RESILIENT MEANS URGING SAID SLEEVE-LIKE MEMBER IN ONE AXIAL DIRECTION, SAID SLEEVE-LIKE MEMBER HAVING AXIALLY SPACED APERTURE MEANS COMMUNICATING THE FIRST CHAMBER AND THE SECOND CHAMBER RESPECTIVELY WITH THE INTERIOR OF SAID SLEEVE-LIKE MEMBER, A PORT COMMUNICATING EACH OF SAID CHAMBERS WITH THE EXTERIOR OF THE VALVE BODY, AN ORIFICE PLATE DISPOSED INTERIORLY IN SAID SLEEVELIKE MEMBER INTERMEDIATE SAID SPACED APERTURE MEANS AND ADAPTED TO CREATE A PRESSURE DROP ACROSS SAID PLATE UPON APPLICATION OF FLUID PRESSURE TO ONE OF SAID PORTS, SURFACE MEANS IN SAID VALVE BODY ADAPTED FOR COACTION WITH CERTAIN OF THE APERTURE MEANS, TO CLOSE THE SAME UPON PREDETERMINED AXIAL MOVEMENT OF SAID SLEEVE-LIKE MEMBER AGAINST THE RESISTANCE TO COMPRESSION OF SAID RESILIENT MEANS, ANOTHER VALVE MECHANISM DISPOSED IN SAID BODY AND EXTENDING INTO A THIRD CHAMBER, A PORT COMMUNICATING SAID THIRD CHAMBER WITH THE EXTERIOR OF THE VALVE BODY, SAID OTHER VALVE MECHANISM INCLUDING A PISTON MEMBER AXIALLY MOVABLE IN A CYLINDER CHAMBER, PASSAGEWAY MEANS COMMUNICATING SAID CYLINDER CHAMBER WITH SAID FIRST CHAMBER, RESILIENT MEANS URGING SAID PISTON MEMBER OUTWARDLY OF SAID CYLINDER CHAMBER, SAID PISTON MEMBER INCLUDING A STEM PORTION PROJECTING THEREFROM, A POPPET-LIKE VALVE MEMBER SLIDABLY MOUNTED ON SAID STEM PORTION, RESILIENT MEANS EXTENDING BETWEEN SAID POPPET-LIKE VALVE MEMBER AND SAID PISTON MEMBER AND URGING SAID POPPET-LIKE VALVE MEMBER AWAY FROM SAID PISTON MEMBER, A VALVE SEAT DISPOSED IN SAID VALVE BODY, PASSAGEWAY MEANS COMMUNICATING THE VALVE SEAT WITH SAID SECOND MENTIONED CHAMBER, SAID POPPET-LIKE VALVE MEMBER BEING ADAPTED FOR SEALING ENGAGEMENT WITH SAID VALVE SEAT FOR CLOSING SAID THIRD CHAMBER FROM THE FLUID PRESSURE IN SAID SECOND CHAMBER, BUT BEING DISENGAGEABLE FROM SAID VALVE SEAT UPON MOVEMENT OF SAID PISTON MEMBER IN A DIRECTION AWAY FROM SAID POPPET-LIKE VALVE MEMBER AND SAID PREDETERMINED AXIAL MOVEMENT OF SAID SLEEVELIKE MEMBER.